The Witcher games are pretty cool, somewhat despite the triteness of the main character, but did you know there is an in-depth documentary about them?
Check out this multi-part series from Noclip that goes in-depth with The Witcher games and the team that made them:
The Story of CD Projekt
Remembering The Witcher 1 & 2
Designing the World of The Witcher 3
Designing the Quests of Wild Hunt
Translating & Adapting the Witcher
Devil's in the Deails